Please understand two things; Your Mexican mover is responsible for your move IN Mexico. Your US mover will back your stuff and move it to the border.
All restrictions are from the Government of Mexico, not the mover(s).
Strom-White moved us without and damage or difficulty.

I think in this case the phrase "show up" means different things. Hensley is saying they don't show up for service calls. bmh and NJExpat are saying the monitoring service reacts well in case of an alarm.